.bannerBox{
  width: 400px;
  height: 300px;
  overflow: hidden;
  margin: auto;
  background: #eee;
  .ul_list_box{
    list-style: none;
    overflow: hidden;
    padding: 0;
    margin: 0;
    li{
      width: 400px;
      height: 300px;
      float: left;
      background-color:lemonchiffon;
    }
    li:nth-child(2n){
      background-color:darkgoldenrod;
    }
  }
}